A new study by the National Institutes of Health (NIH) has highlighted challenges in diagnosing long Covid. Routine lab tests are deemed unreliable for this purpose. Dr. David Goff emphasised the need for quick and accurate diagnosis to provide appropriate care. Long Covid symptoms can persist for months or years, affecting daily activities. The study involved over 10,000 adults but found limited differences in biomarkers between Covid-infected and uninfected individuals. Researchers are working on developing better diagnostic tests for long Covid.